U-Discover Mag Lists The 50 Greatest Jazz Albums

Ok. Then which recordings would you substitute for those; and why?

I don't know and I don't care how many albums I own that are part of R&R hall of fame or any other fame magazines.
Being famous or best is very often associated with level of promotions and investments in to the artist apart from performance quality that even in quite number of cases isn't up to par.

May be true, but not in the case of the three mentioned recordings.

Here's what I would substitute for the fusion choices on the list -- Tony William's Lifetime "Emergency!", Miles Davis "Tribute to Jack Johnson" and Chick Corea "Light As A Feather". Of course keep "Bitches Brew".

Just pickin' nits.

Undoubtedly great recordings, but with the possible exception of "Light As A Feather", imo they don't have the historical relevance of the ones in question. When there are so many "greats" to choose from, I think that "greatest" should be reserved for those that are not only great performances, but are also very important bynbeing landmark recordings in the evolution of the music. "Headhunters" was a masterpiece of the genre and incredibly influential with funk grooves that are still being sampled today. For better or for worse, hip-hop as we know it today would be very different had there been no "Headhunters". The addition of Jaco Pastorious to Weather Report's lineup would forever change the way that the electric bass was played and its role in a rhythm section. The influence of Jaco, not to mention the band, cannot be overstated. I like the choice of "Light As A Feather" for bringing the "Spanish" flavor to fusion-jazz; something that would become very prevalent.